Avantone Pro Active MixCube 5.25" Powered Studio Monitor - Retro Cream (each) Sold as a single monitor Balanced Input: This combo XLR input accepts a Balanced male XLR plug as well as a 3-conductor Balanced TRS 1/4-Inch or a 2 conductor Unbalanced TS 1/4-Inch male plug System Gain: This variable control adjusts the sensitivity of the signal that appears at the input On/Off Switch: This illuminated switch turns the amplifier section on and off